VALVE SEAT INSPECTION/REPAIR

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1. Measure the contact width of the valve face and the valve seat using the valve lapping compound.

• If it is not within the specification, resurface the valve seat using the 45° valve seat cutter.

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Standard valve seat contact width

1.2—2.0 mm {0.048—0.078 in}

Valve seat angle

45°

2. Verify that the area where the valve seat contacts the valve face is centered.

• If the seating position is too high, correct the valve seat using a 60° (IN) 75°(EX) valve seat cutter and a 45° valve seat cutter.

• If the seating position is too low, correct the valve seat using a 30° valve seat cutter and a 45° valve seat cutter.

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3. Inspect the valve seat for sinkage.

• If it is not within the specification, replace the cylinder head.

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Standard valve seat sinkage amount

IN: 0.56—0.96 mm {0.023—0.037 in}

EX: 0.47—0.87 mm {0.019—0.034 in}